The production of a thin coating of one metal on another by electodeposition. It is very extensively used in industry and is continuing to enlarge its useful functions. Various plated metal and combinations therof are being used for different purposes, to illustrate: 1. Decorative and protection against corrosion..............copper, nickel and chromium . 2. Protection against corrosion.......................................cadmium or zinc . 3. Protection against wear..............................................chromium . 4. Build-up of a part or parts undersize............................chromium or nickel . 5. Pate for rubber adhesion.............................................brass . 6. Protection against carburization and for brazing operations....copper and nickel